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4.3=a+3.8
We move all terms to the left:
4.3-(a+3.8)=0
We get rid of parentheses
-a-3.8+4.3=0
We add all the numbers together, and all the variables
-1a+0.5=0
We move all terms containing a to the left, all other terms to the right
-a=-0.5
a=-0.5/-1
a=0.5/1
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